Revamped version of the iPhone 3G with faster processing speeds. Repair of this device is similar to the 3G, and requires simple screwdrivers and prying tools. Model A1303 / 16 or 32 GB capacity / black or white plastic back.

iPhone 3GS 32GB White Back, Booting to blackscreen.

I have replaced the digitizer. It was working before but with cracked digitizer. It is seen in itunes 12, It restores fine, unlocked IOS 6.1. no errors. Deleted all apps to stop conflicts. Just goes to apple then boots to a blue/black screen. Will not fully boot in Redsnow 0.9.15b3 when a Recovery fix it is performed. I can put in to recovery and DFU. Home and Power/Sleep buttons appear to be working fine. Taken apart and checked the cables 1 through to 3 seems fine.

Battery has been fully charged to 100% not replaced but seems to last a couple of days at least.

Any help suggestions would be very much be appreciated.

Much Later.... After some more research it sounds like proximity sensor issues. Can't anyone confirm this as a good bet.

Resources

Repairability

Stay in the loop

It's time to speak out for your right to repair

We have a chance to guarantee our right to repair electronic
equipment—like smartphones, computers, and even farm equipment. This is a once-in-a-generation
chance to protect local repair jobs—the corner mom-and-pop repair shops that
keep getting squeezed out by manufacturers.

Join the cause and tell your state representative to support Right to Repair. Tell them you believe repair should be fair, affordable, and accessible. Stand up for your right to repair!